initial commit of android credential provider service (wip)

src/Xamarin.AndroidX.Credentials/Additions/AboutAdditions.txt

@@ -0,0 +1,48 @@
+Additions allow you to add arbitrary C# to the generated classes
+before they are compiled.  This can be helpful for providing convenience
+methods or adding pure C# classes.
+
+== Adding Methods to Generated Classes ==
+
+Let's say the library being bound has a Rectangle class with a constructor
+that takes an x and y position, and a width and length size.  It will look like
+this:
+
+public partial class Rectangle
+{
+    public Rectangle (int x, int y, int width, int height)
+    {
+        // JNI bindings
+    }
+}
+
+Imagine we want to add a constructor to this class that takes a Point and
+Size structure instead of 4 ints.  We can add a new file called Rectangle.cs
+with a partial class containing our new method:
+
+public partial class Rectangle
+{
+    public Rectangle (Point location, Size size) :
+        this (location.X, location.Y, size.Width, size.Height)
+    {
+    }
+}
+
+At compile time, the additions class will be added to the generated class
+and the final assembly will a Rectangle class with both constructors.
+
+
+== Adding C# Classes ==
+
+Another thing that can be done is adding fully C# managed classes to the
+generated library.  In the above example, let's assume that there isn't a
+Point class available in Java or our library.  The one we create doesn't need
+to interact with Java, so we'll create it like a normal class in C#.
+
+By adding a Point.cs file with this class, it will end up in the binding library:
+
+public class Point
+{
+    public int X { get; set; }
+    public int Y { get; set; }
+}

src/Xamarin.AndroidX.Credentials/Transforms/EnumFields.xml

@@ -0,0 +1,15 @@
+<enum-field-mappings>
+  <!--
+  This example converts the constants Fragment_id, Fragment_name,
+  and Fragment_tag from android.support.v4.app.FragmentActivity.FragmentTag
+  to an enum called Android.Support.V4.App.FragmentTagType with values
+  Id, Name, and Tag.
+  
+  <mapping jni-class="android/support/v4/app/FragmentActivity$FragmentTag" clr-enum-type="Android.Support.V4.App.FragmentTagType">
+    <field jni-name="Fragment_name" clr-name="Name" value="0" />
+    <field jni-name="Fragment_id" clr-name="Id" value="1" />
+    <field jni-name="Fragment_tag" clr-name="Tag" value="2" />
+  </mapping>
+  -->
+</enum-field-mappings>
+

src/Xamarin.AndroidX.Credentials/Transforms/EnumMethods.xml

@@ -0,0 +1,14 @@
+<enum-method-mappings>
+  <!--
+  This example changes the Java method:
+    android.support.v4.app.Fragment.SavedState.writeToParcel (int flags)
+  to be:
+    android.support.v4.app.Fragment.SavedState.writeToParcel (Android.OS.ParcelableWriteFlags flags)
+  when bound in C#.
+  
+  <mapping jni-class="android/support/v4/app/Fragment.SavedState">
+    <method jni-name="writeToParcel" parameter="flags" clr-enum-type="Android.OS.ParcelableWriteFlags" />
+  </mapping>
+  -->
+</enum-method-mappings>
+

src/Xamarin.AndroidX.Credentials/Transforms/Metadata.xml

@@ -0,0 +1,12 @@
+<metadata>
+  <attr path="/api/package[@name='androidx.credentials']" name="managedName">AndroidX.Credentials</attr>
+  <attr path="/api/package[@name='androidx.credentials.provider']" name="managedName">AndroidX.Credentials.Provider</attr>
+  <attr path="/api/package[@name='androidx.credentials.exceptions']" name="managedName">AndroidX.Credentials.Exceptions</attr>
+  <attr path="/api/package[@name='androidx.credentials.webauthn']" name="managedName">AndroidX.Credentials.WebAuthn</attr>
+
+  <!-- fix companions -->
+  <attr path="/api/package/class[substring(@name,string-length(@name)-9)='.Companion']" name="managedName">CompanionStatic</attr>
+  <remove-node path="/api/package/class[substring(@name,string-length(@name)-9)='.Companion' and count(method)=0 and count(field)=0]" />
+  <attr path="/api/package/class[substring(@name,string-length(@name)-7)='.Default']" name="managedName">DefaultStatic</attr>
+  <remove-node path="/api/package/class[substring(@name,string-length(@name)-7)='.Default' and count(method)=0 and count(field)=0]" />
+</metadata>

src/Xamarin.AndroidX.Credentials/Xamarin.AndroidX.Credentials.csproj

@@ -0,0 +1,18 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net8.0-android</TargetFramework>
+    <SupportedOSPlatformVersion>21</SupportedOSPlatformVersion>
+
+    
+	<!--<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'ios'">11.0</SupportedOSPlatformVersion>
+	<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android'">21.0</SupportedOSPlatformVersion>-->
+
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <RootNamespace>XamarinBinding.AndroidX.Credentials</RootNamespace>
+  </PropertyGroup>
+  <ItemGroup>
+
+    <PackageReference Include="Xamarin.Kotlin.StdLib" Version="1.9.10.1" />
+  </ItemGroup>
+</Project>